Invalid Period token aToken on aDate : week numbers must be in the range 001-053

The current duration token refers to an absolute week period (ie. week number X of year Y) outside of the 1-53 range. This is equivalent to asking for the 8th day of the week, and makes no sense. Make sure you have not made a typo, or wanted to use relative week periods instead, such as [Fe:w+99] which although strange, is allowed.